Aqua Medic mV Electrodes (Redox-potential) are quality products designed for both accurate measurement and long, trouble free use. mV Electrodes are available in two versions: standard electrodes with plastic shaft and with plastic shaft and PG 13.5 thread,which are pressure resistant up to 3 bar, and can be used in plumbing fittings or in the closed versions of the Nitratereductors NR 400 and Calciumreactors KR 400. These electrodes are also available in a short version for the KR 1000 and the NR 1000.